他们发现大多数因为自然原因失去伴侣的老年人从悲痛中恢复过来要比我们所预期的更快。
They have found that most older people who lose spouses from natural causes recover much more quickly than we have come to expect.
但是，因为健康和安全的原因，也担心会弄脏或造成破坏，孩子们经常被阻止与自然环境接触。
But children are frequently discouraged from involvement with natural Spaces for health and safety reasons for fear that they might get dirty or that they might cause damage.
科学家确信，变化归咎于人类的排放，因为这个增长过快，无法用自然原因解释。
Scientists are confident this change can be blamed on human emissions because the increase is too big to be explained by natural causes.
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